Partial transcript of press briefing remarks by Boston Police Commissioner Ed Davis on the deadly incidents at MIT and the shooting and explosions in Watertown. The press briefing was held at approximately 4:30 a.m. EST on April 19, 2013:
This is an ongoing investigation. We can’t get into details on the description of the suspects or the names. We’re trying to get information out to the people who live here that they should stay in their homes and not open their doors unless police officers are there. There’s a 20 block perimeter around the location that Chief [Edward] Deveau just talked about. We are concerned about securing that area and making sure that this individual is taken into custody. We believe this to be a terrorist. We believe this to be a man who’s come here to kill people. We need to get him into custody.

One thing that I just want to say is that there have been 2 police officers – one killed and one badly injured tonight. Our sympathies go out to [MBTA Police] Chief [Paul] MacMillan who has a severely injured officer at the hospital and to Chief [John] DiFava at the MIT Police and to the families of those officers. This is a terrible tragedy. We don’t want to increase it. We want to be very careful.